Roboform
Roboforms were scavengers who traveled alongside invaders.
Biology
Roboforms were robots that normally had vaguely skull-like heads that were cream coloured. They were normally seen with full length black robes which concealed most of their bodies leaving their robotic faces visible.
When the Doctor confronted them, they wore bullet-proof Santa Claus suits and metal masks to blend in. While in disguise, they played music on trombones and tubas which doubled as flamethrowers and rocket launchers. They also used remote controlled Christmas trees that had bombs disguised as ornaments.
Appearances
The Christmas Invasion (TV)
The Runaway Bride (TV)
The Pandorica Opens (TV)
Silent Knight (Comic)